气相色谱法分析非极性组分时应首先选用()固定液,组分基本按()顺序出峰,如为烃和非烃混合物,同沸点的组分中()大的组分先流出色谱柱。
参考答案:非极性;沸点;极性
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第二节 语法填空(共10小题;每小题1.5分, 满分15分)
阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填人一个适当的词或使用括号中词语的正确形式填空, 并将答案填写在答题卡标号为51~60的相应位置上。
Many people are perfectly willing to be volunteers, __51__ they just aren’t sure where to start.
Your local animal shelter or vet’s is the perfect place to start off __52__ you want to help animals. Not interested in working with animal? Children in children’s hospitals might be dying __53__ (entertain) with jokes and games because parents aren’t able to be there constantly. You could offer your services __54__ just a friend. An idea for working with kids is __55__ (volunteer) as a tutor for __56__ who are failing behind in school. If you are good on the phone, you might consider __57__ (join) the local emergency hotline.
Other volunteer jobs in __58__ you might be interested include volunteering in a nurse’s aid in the hospital, driving the __59__(disability), working in the soup kitchen and picking up waste along the beach and highway. __60__ are plenty of chances to volunteer, no matter where you live.
工程建设定额中分项最细、定额子目最多的一种定额是( )。
A.概算指标
B.概算定额
C.预算定额
D.施工定额